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func sumZero(n int) []int {
    if n <= 0 {
        return []int{}
    }
    res := make([]int, n)
    for i := 0; i < n - 1; i++ {
        res[i] = i
    }
    res[n-1] = - ((n - 2) * (n - 1) >> 1) 
    return res
}